Revert r111031. The way LLVM defines loop invariance, the property of an

expression being loop invariant is not equivalent to the property of
properly dominating the loop header.

Other optimizations have also made this optimization less important.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111160 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Analysis/ScalarEvolutionExpressions.h b/include/llvm/Analysis/ScalarEvolutionExpressions.h
index 4baaa4506c14b4a28d6ad51e262a820bab7dd18d..4213a287011b56043549dbc6a7d2290351a27f5f 100644 (file)
--- a/include/llvm/Analysis/ScalarEvolutionExpressions.h
+++ b/include/llvm/Analysis/ScalarEvolutionExpressions.h
@@ -126,12 +126,6 @@ namespace llvm {
   public:
     virtual void print(raw_ostream &OS) const;
 
-    virtual bool hasComputableLoopEvolution(const Loop *QL) const {
-      // Not computable. A truncate of an addrec is always folded into
-      // the addrec.
-      return false;
-    }
-
     /// Methods for support type inquiry through isa, cast, and dyn_cast:
     static inline bool classof(const SCEVTruncateExpr *S) { return true; }
     static inline bool classof(const SCEV *S) {
@@ -281,12 +275,6 @@ namespace llvm {
     }
 
   public:
-    virtual bool hasComputableLoopEvolution(const Loop *QL) const {
-      // Not computable. An add of an addrec is always folded into the addrec
-      // if the other operands are loop-variant or loop-computable.
-      return false;
-    }
-
     virtual const char *getOperationStr() const { return " + "; }
 
     virtual const Type *getType() const {
@@ -315,12 +303,6 @@ namespace llvm {
     }
 
   public:
-    virtual bool hasComputableLoopEvolution(const Loop *QL) const {
-      // Not computable. A mul of an addrec is always folded into the addrec
-      // if the other operands are loop-variant or loop-computable.
-      return false;
-    }
-
     virtual const char *getOperationStr() const { return " * "; }
 
     /// Methods for support type inquiry through isa, cast, and dyn_cast: